Tube-expander.



TUBE BXPANDBR.

'15102,9-93, 3' ma Patented Jul)Y 7, 1914.

` HEET 2.

0TTO WIEDEKE rrp s'rATES PATENT FFICE' OTTO WIEDEKE, OF DAYTON, OHIO,ASSIGNOR OF ONE-HALF TO GUSTAV WIEDEKE, OF DAYTON, OHIO.

TUBE-EXPANDER.

Application filed November 13, 1913.

To all whom t may concern Be it known that I, OTTO WIEDEKE, a citizen ofthe United States, residing at Dayton, in the county of Montgomery andState of Ohio, have invented certain new and useful Improvements inTubeExpanders; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters and figures of reference marked thereon, which form a part ofthis specification. n

This invention relates to new and useful improvements in tube expandersor implements for expanding the ends of tubes in the tube sheets ofboilers. n

The invention is especially adapted for expanding arch tubes oflocomotive boilers which, owing to the presence of the water legs,requires an expander of comparatively greater length in order to reachthe end of the arch tube from the outside of the'boiler.

The objects of the invention are several, principally among which are toprovide means in this type of tube expander for preventing the expandingrollers from dropping inwardly and becoming displaced from the tool whenthe mandrel is withdrawn; and to provide convenient means for enablingthe operator to determine the extent of insertion of the mandrel as thetool is being operated to expand the tube.

Preceding a detail description of the invention, reference is made tothe accompanying drawings, of which- Figure 1 is a longitudinal sideelevation of a tube expander constructed in accordance with myinvention; Fig. 2 is a longitudinal section of the same on the line e-eof Fig. l; Fig. 3 is a section on the line a-a of Fig. 2; Fig. 4 is asection on the line -b of Fig. 2; Fig. 5 is a section on the line o o ofFig. 2; Fig. 6 is a view of the mandrel; Fig. 7 is a section on the linecZ-cl of Fig. 2; Fig. 8 is an enlarged sectional view of the head of thetool showing the manner of inserting the rollers; and Fig. 9 is a detailview of the ring which is instrumental in holding the rollers inposition.

In a detailed description of the invention, similar reference charactersindicate corresponding parts throughout the speoica tion and drawings.

Specication of Letters Patent.

Patented July 7, 1914.

Serial No. 800,872.

The body of the tool is lengthened as compared with the ordinary tubeexpander because of its being designed to extend through the water legof a boiler to expand arch tubes as before stated. The said bodyconsists of a shank or barrel l terminating at its forward end in a head2 provided with the usual openings 3 for the expanding rollers t toproject through in making contact with the surrounding surfaces of theboiler tube. The said 'barrel is further provided with a double row ofopenings 5 which will be again referred to in connection with a guard G.The mandrel 7 is insertible throughout the length of the barrel in theusual manner and is made tapered to form a wedgcflike engagement withthe inner sides of the rvexpanding rollers. Referring to the openings 34through which the rollers project, the outer longitudinal edges 8 ofsaid openings are curved inwardly in the usual manner to,` prevent therollers from falling put of the head. The means for preventing saidrollers falling inwardly when the mandrel is withdrawn is as follows: Inorder to facilitate andV make possible the placing of the expandingrollers in position and maintaining them in such position against anytendency to fall inwardly within the head when the mandrel is withdrawn,the inner ends of the slots or openings 3 are provided with outward andrearwardly tapered surfaces 10 which extend from straight surfaces 11.The tapered surfaces 10 permit the rollers to be inserted in theinterior of the head 2 andk to be subsequently raised to a parallelposition which is the operative position of the rollers as is shown inFigs. l and 2. In Fig. 8, the dotted lines show the manner of insertingsaid rollers. l/Vhen in the operative position, the straight surfaces l1form shoulders whichmaintain the rollers against any lengthwise shiftingwhile in operation. Extending from the inner longitudinal margins of theroller openings are inwardly projecting shoulders 9 which extend fromthe inner terminals of the tapered surfaces 10 a sufficient distancev tosupport the rearward ends of the rollers from falling inwardly when themandrel is withdrawn. In inserting the rollers in the manner yshown indotted lines in Fig. 8, the rearward end of each roller is moved inposition above the shoulders 9, such movement being permitted by thetapered surfaces 10. The ends of the rollers 4t opposite the shoulders 9are provided with pins or projections 19 which, when the rollers are inoperative position, lie in pockets 12 at the ends of the openings 3. Theinner ends of the pockets 12 are adapted to be closed by a resilientring 17 j which lies in a suitableannular recess 18 on the interior ofthe'head 2. The said ring 17 lies in the path of the pins 19 therebymaintaining, in connection with the shoulders 9, the rollers 4]: in thepockets 3 `when the mandrel 7 is withdrawn. The length of the pockets 12is vsuch that the rollers Amay have a radial movement during the processof ex* panding the tube. rlhe resilient ring 17 is sprung into therecess 18 through the central opening in the head of the tool.

The guard or ring 6, before referred to, is inclosed by the usualbearing or collar 13. Heretofore, so far as ll am aware, it has been thepractice to unite the said guard to the body of the tool by means of setscrews which engage the outer circumference of the barrel and areprovided with heads which proj ect beyond the circumference of theguard. Such means are often found objectionable in manipulating theimplement because of the fact thatl the heads of the screws frequentlycome in contact with parts of the boiler head when rotating theimplement in the operation of expanding the tubes. /Vith the presentimprovement, the set screws 1A are reduced in diameter at their innerends, as at 15, to enable said screws to enter the openings 5 in thebarrel and to be inserted below the circumference of the guard 6. Anumber of such openings 5 are provided in the barrel to enable thecollar to be shifted to the desired position and there united to thebarrel. To permit of a finer adjustment of the guard 6 withoutdecreasing the strength of the screw at 15 or the barrel 1, the saidopenings are staggered in a double row as is shown in Fig. 1. In thisconnection the present device is an improvement over the device shownand described in my co` pending application, Serial No. 791,505, filedSept. 211, 1913. Y

1n manipulating the implement, it will be understood that the mandrel 7is forced into the barrel as the work of expanding progresses in orderto exert a progressive outward force on the expanding rollers.Heretofore, so far as I am aware, the operator had no guide to directhim in this matter in order that he might know the extent of theinsertion of the mandrel. In order to overcome this objection, I haveprovided on the outer end of the mandrel a series of circular lines 16of equi distance. These lines form an index by which the operator mayknow the extent of the insertion of the mandrel necessary to accomplishthe expansion of the tube.

Having described my invention, I claim.

1. A tube expander, comprising an elongated cylindrical body terminatingat vone end in a head provided with the necessary roller apertures, therearward end walls of said apertures being tapered outwardly and havinginwardly lying shoulders extending therefrom, a series of expandingrollers confined within said apertures, the rearward ends of which liebetween said shoulders and the outer longitudinal edges of theapertures, a pin extending from one end of each of said rollers, andmeans in the head in a position to be engaged by said pins andsupportingV the outer ends of said rollers.

2. A tube expander, comprising a cylinwalls of said openings beingtaperedV and the rearward sides having shoulders extending inwardlytherefrom, a series of expanding rollers within the openings in said.head, an axial pin extending from one end of each of said rollers, saidhead being provided with pockets at the ends of said openings to receivesaid pins, and means in said head inaposition to be engaged by said pinsand supporting the outer ends of said rollers.

3. A tube expander, comprising a'cylin-v drical body. terminating at oneend in a head provided with roller openings, the rearward walls of saidopenings being tapered andthe rearward sides of said openings havingshoulders extending inwardly therefrom, a series of expanding rollersmounted therein, an axial pin extending from one end of each or' saidrollers, said head being provided with pockets at the ends of saidopenings to receive said pins, and a resilient ring mounted in said headin a position to be engaged by said pins and adapted to support theouter ends of said rollers.

ln testimony whereof I afl'ix my signature, in presence of twowitnesses.

OTTO VVIEDEKE. l/Vitnesses:

BERTHA VIEDEKE, MATTHEW `SIEBLER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

